Dowel for concrete structures



April 1930. B. BRIODY 1,752,327

DOWEL FOR CONCRETE STRUCTURES Filed Oct. 11, 1928 I INVENTOR. 9 BernardBriod A TTORNEY Patented Apr. 1,1930

UNITED STATES.

PATENT OFFICE BERNARD BRIODY, or YOUNGSTOWN, OHIO, AssIGNoRTo TRUSCONSTEEL coMrANY,

or YOUNGSTOWN, OHIO, A CORPORATION or MICHIGAN DOWEL FOR CONCRETESTRUCTURES Application filed October 11, 1928. Serial 1T0. 811,872.

In the construction of concrete roads, it has been found desirable incertain cases and under certain conditions to make them in sections,preferably in the form of reenforced 6 slabs. It has furthermore beenfound that in order to prevent these slabs heavin or becoming elevatedat their edges one above the other, it is desirable to dowel themtogether. As these sections or slabs have a 10 certain amount ofcontraction and expansion,

the anchoring therein of the dowels has created stresses, causingundesirable fractures. The object of the present invention is to providea dowel structure that will constitute an efl'ective holding means andat the same time will permit free expansion and contraction, said meansmoreover being readily utilizable with the joint-forming strips andbeing positively positioned in place during thepouring of the concrete.

A preferred embodiment of the inventlon is illustrated in theaccompanying drawings, wherein:

Figure 1 is a plan view of a road section 26 indicating the dowelstructures in place therein.

Figure 2 is a perspective view of a portion of the joint or partingstrip and a dowel in place therein.

Figure 3 is a horizontal sectional view through the same.

Figure 4 is a view in elevation of the tubular section of the dowel.

Figure 5 is a cross sectional view on the 36 line 5-5 of Figure 3.

The roadway, as shown, is designated A and is made up of concretesections or slabs B, forming joints C. These joints are ordinarilyformed by a joint or parting strip of sheet metal, a portion of which isshown at 6 in Figure 2. This parting strip as is well known is placed onthe sub-base of the roadway in vertical position, and the concrete is 5poured against the opposite sides of the same.

It is preferably provided with a central 011- set 7 that forms a keywhich effects an interlock between the adjacent ends or edges of the twoslabs or sections B. In the present embodiment this ofiset portion 7 isprovided the chair constitute legs 12 that preferably a seat 11 thatreceives the ro The two parts are electrically welded at their points ofintersection. The end portions ofthe rod of terminate in outturned feet13. This chair, it will be understood, supports the rod section insubstantially horizontal position.

On the opposite end portion of said rod section 9, and'therefore on theopposite side of the strip 6 to the chair is slidably mounted a tubulardowel section 14. This is preferably made of relatively light sheetmetal, and has its outer portion tapered off to a fiat shape, saidportion being bent downwardly to form a supporting leg 15. The tubularportion may have an inturned lug 16 stamped therefrom and constituting astop against which the end of the rod section 9 is abutted.

In assembling the parts, it will be understood that the strip 6 ispositioned on the sub-base and the rod sections 9 are passed through theopenings 8 and supported by the chairs 1013. The tubular sections 14 arethen telescoped on the free projecting ends of the rod sections and arein like manner supported by theirlegs 15. The dowels are thus firmlysupported and will not become displaced by the action of the concretewhen poured upon and around them. When the concrete has set, the dowelsof course remain embedded therein, but any contraction or expansion cantake lace freely without -resistance because the ee end of the dowlsection 9 being enclosed in the tubular section 14, these parts canrelatively slide on each other. Each, however is not only embedded inits respective rod section or slab, but is anchored therein by the.chair and le 15. Theiractioninpreventingthe-heavingo mo one slab abovethe other is moreover entirely eflicacious since no relative lateralmovement can occur. This is for the' reason that the rod section isactually embedded in the meeting end portions of adjacent slabs, thoughhoused within the tubular section 14.

From the foregoing, it is thought that the construction, operation andmany advantages of the herein described invention will be apparent tothose skilled in the art, without further description, and it will beunderstood that various changes in the size, shape, proportion and minordetails of construction may be resorted to without departing from thespirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. A dowel structure for concrete roads and the like, comprisingtelescoping sections, each adapted to be embedded in adjacent con.-crete slab members, and supporting members secured to said sections andconstituting permanent anchors therefor in the concrete.

2. A dowel structure for concrete roads and the like, comprising a rodsection and a tubular section slidably telescoping the same, each ofsaid sections having a supporting leg permanently connected thereto andpermanently embedded in the concrete.

3. A dowel structure for concrete roads and the like, comprising a rodsection, a su porting chair located transversely "of an permanentlysecured to the outer end portion of said rod section and havingdepending supporting and anchoring le and a tubular section slidablytelescope on the free end portion of. the rod section and having adepending supporting and anchoring leg at its outer end permanentlyconnected thereto.

4. A dowel structure for concrete roads and the like, including a rodmember and a transversely disposed supporting chair comprising atransversel disposed inverted substantially U-shaped racket, permanentlysecured at its central ortion to the rod member, with the depen g endportions forming spaced supporting legs.

5. A dowel structure for concrete roads and the like, including a rodmember and a transversely disposed supporting chair comprising atransversely did, inverted subra :et

stantiall U-shaped having a downwardly wed cross bar extendin beneathand secured to the end of the r member,

'to one end of the same, a tubular section slidably telescoping theother end of the rod sec tion and located on the opposite side of theparting strip to the chair, and a supporting leg for the outer end ofthe tubular section.

In testimony whereof, I aflix my si ature.

BERNARD BRI DY.

with the depending end portions forming spaced supporting legs.

6. In combination a partiitg strip provided with an opening and a owelcomdpris: in a rod section, a tubular section sli ably eseoping the rodsection, one of 'said sections passing through the opening in theparting strip, and means permanently secured to one of the members atone side of the partin strip for supporting the dowel during emfiedmentin the concrete, said sup-

